GM has issued a service update to address a problem related to the Transmission Control Module in certain 2020 and 2021 model-year C8 Corvette Stingray models. 2020 and 2021 model-year vehicles
According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses “torque converter clutch (TCC) shudder conditions on 8L45 and 8L90” eight-speed automatic transmissions, RPO codes M5N, M5T, M5U, and M5X. Affected vehicles include Chevrolet, GMC and Cadillac vehicles, as follows. Chevrolet. 2015 – 2018 Chevrolet
5. Slipping Clutch. If your clutch goes to the floor, or your gears make an awful sound when you try to shift, that could indicate transmission problems. Richard Goerg/Getty Images. This transmission trouble sign haunts stick shift drivers: the dreaded dragging or slipping clutch.
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